5.4B Equations to Solve Problems

Mia and Katelyn are on the same softball team. Katelyn has scored three times as many times as Mia. Mia has scored 8 times this season. How many scores, s, has Katelyn made this season?

• 8 + 3 = s  

• 8 - 3 = s

• 8 x 3 = s

• 8  $\div$   3 = s

Mrs. McFarland baked 125 brownies. She kept 17 brownies for her family, divided the rest of the brownies into 54 treat bags for her students. Which equation can be used to find  b, the number of brownies each student receives?

• 125 - 17 - 54 =  b

• (125 - 17) x 54 = b

• (125 + 17)  $\div$  54 = b

• (125 - 17)  $\div$  54 = b

Morgan has a square poster. Each side measures 13 inches. Which equation can be used to solve for the perimeter of the poster?

• 13 x 13 = p

• 4 + 13 = p

• 13 + 13 = p

• 4 X 13 = p

The basketball team is selling brownies and cupcakes for a fundraiser bake sale. They charge $0.75 for a brownie and $1.25 for a cupcake. They sell 34 brownies and 57 cupcakes. Which equation represents how to solve for t, the total amount of money the basketball team raised?

• (57 x 0.75) + (34 x 1.25) = t

• (57 x 1.25) + (34 x 0.75)

• (57 x 0.75) - (34 x 1.25) = t

• (57 x 1.25) - (34 x 0.75)

Jeff installs Christmas lights. He has 125 feet of lights. He needs 12 feet per window and 22 per door. Jeff installs 6 windows and 2 doors. Which equation represents n, the amount of lights left over?

• n = 125 - (12 + 22)

• n = 125 - [(12 x 6) - (22 x 2)]

• n = 125 -[(12 x 2) + (22 x 6)]

• n = 125 -[(12 x 6) + (22 x 2)]

Matt earned $15 for every car he washed on Saturday. If he earned $180, how many cars, c, did he wash?

• c = 12, because 180 $\div$ 15 = c

• c =14, because 15 x c = 180

• c = 16, because c x 15 = 180

• c =13 because 180 $\div$ c = 15

Matthew packed 31 green apples and 41 red apples into a box for the food pantry. He packed 8 more boxes like this. Matthew used this equation to find a, the number of apples he packed into all the boxes.

a = (31 + 41)8

How many apples did Matthew pack into the boxes?

• 576

• 568

• 80

• 10,168

A family spent $93 at the fair.

They spent $18 on admission and $36 on food.

They spent the rest of the money on games. Which equation can be used to find g, the amount spent of games?

• 93 = g + 36 - 18

• 93 = 36 - 18 - g

• 93 = 18 + 36 + g

• 93 = 18 + 36 - g

Three friends rode their bikes last week. Christina rode her bike 27 kilometers. Meredith rode her bike 12 kilometers less than Christina. Derek rode his bike 3 times as far as Meredith. Which equation represents k, the distance in kilometers Derek rode his bike?

• (27 + 12) $\div$ 3 = k

• (27 - 12) x 3 = k

• (27 - 12) $\div$ 3 = k

• (27 + 12) x 3 = k

Jocelyn walks her dog twice per day. The morning walk last 25 minutes and the evening walk lasts 45 minutes. Which equation can be used to find m, the total minutes Jocelyn spends each week walking her dog?

• 25 + 45 x 7 = m

• (25 x 7) - (45 x 7) =m

• (25 + 45) x 7 =m

• 7 x 25 + 45 =m